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India has struggled to generate enough power of its own to fuel businesses and light homes, and the country relies on huge imports of coal and oil to power its own plants. But supply and demand may not explain away this week’s grid failures, power executives said.

The failure on Tuesday affected roughly twice as many people as the massive power outage the previous day, when the northern power grid failed and left more than 300 million people without power for several hours. No official reason for the Monday’s failure has been given, although some local news reports pointed fingers at state governments which were overdrawing power.

That assessment is too simplistic, Mr. Saxena, of BSES, said. There are controls in place on India’s electricity grids that override an outsized power demand. “We have one of the most robust, smart grids operating” in the world, he said. It would “not be wise” to give an assessment of what happened at this time, he added.